Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Additional Information (Detail)

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Commitments and Contingencies - Additional Information (Detail)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Aug. 01, 2015
ft²
Feb. 28, 2015
USD ($)
ft²
Sep. 30, 2017
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Feb. 01, 2015
USD ($)
Other Commitments [Line Items]            
Expiration of operating lease agreement       2018-09    
Consolidated rent and operating expense relating to Vancouver and Bothell     $ 100,000 $ 100,000 $ 0  
Indemnification obligations     $ 0 0    
Expenses related to indemnification issues       $ 0    
Grosvenor International Limited [Member]            
Other Commitments [Line Items]            
Area of office space leased | ft²   11,526        
Expiration date of option to lease additional area of office space   Aug. 01, 2015        
Lease expiration date   Apr. 30, 2018        
Optional lease renewal   3 years        
Monthly base rent commencement date   May 01, 2015        
Lessee's share of property tax percentage.   17.00%        
Construction allowance received for leasehold improvements           $ 100,000
Deposit amount under lease agreement           $ 200,000
Additional office space | ft² 2,245          
Grosvenor International Limited [Member] | Minimum [Member]            
Other Commitments [Line Items]            
Monthly base rent   $ 18,000        
Grosvenor International Limited [Member] | Maximum [Member]            
Other Commitments [Line Items]            
Monthly base rent   $ 20,000